.nav {
  margin-left: 10px;
  padding-left: 10px;
  border-left: 10px;
}

.plane {
  width: 59px;
  height: 59px;
  left: 59px;
  top: 59px;
}

ul li {
  list-style: none;
  float: left;
}
ul li a {
  display: block;
  height: 100px;
  width: 100px;
  background: red;
}
ul li a:hover {
  background: yellow;
}

#box {
  float: left;
  height: 200px;
  width: 100px;
  -moz-border-radius: 10px;
  -webkit-border-radius: 10px;
  border-radius: 10px;
  background: red;
}
